OVL 1.25" Lunar/Planetary Filter Set

Blocks night glow and airglow, sodium and mercury emissions (but not UV or IV). 

The Twist Lock  Adaptor is an innovative 2″-1.25″ low-profile helical self-centering eyepiece adaptor, of metal construction, threaded to accept standard 2″  filters. 

This UV/IR cut filter blocks UV and IR rays to maintain the colour temperature you want, eliminating false colour fringes around bright stars.